I also was was curious about this topic.
I get the late afternoon sun that shines through my larger tank. I also noticed that my fish will cuddle in the sunlight spots and my anenome & polyp corals come right out. But I did notice a brown algae film that never came until the natural sunlight. The algae will form on my glass where the sun light shines through. So far it hasn't caused any problems though.
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~ LeeWorld ~
"Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony Calfo
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